In rebar building, (although we contact the Communication Center of the June 28, Iris Corporation, still no reply) transmitter and receiver, but to be available on Ri 30m distance was a questionable amount of money is better here cheaper from actually buying because, we were allowed to try its performance. (So ​​far, so it had to borrow the nursing care of the rental product did not become useless) this is only the distance, but I'm very satisfied with a good sensitivity.

It was purchased for use in crime prevention, better reception sensitivity than I thought
We are satisfied. Improvements if you can adjust the number of seconds that rang of chime
It can be set according to the application.